23 centktietros apart. The anterior portion of the skull is relatively 

 narrow and pointed in front, and narrows to an acute-angled median 

 crest above, posterior to which, and a1 die base of the large ])rotnlx'rancc, 

 opens the large nasal fossa. The brain case is probably relatively 



small. 



The dentition, as far as vet seen, consists of seven cheek teeth, the 

 most anterior being close up to the extremity of the skull, hut indis- 

 tinct alveoli suggest the presence of a pair a small incisors in both jaws, 

 so that [. 1/1, P.M. 4/4, M. 3/3 probably represents the dental formula. 

 The mandible (of another individual) is massively built, the coronoid 

 process rising from close behind the posterior molar ; it has a transver- 

 sely placed condyle, is tapering and pointed in front and, as already 

 mentioned, probably bore a pair of small incisor tusks. 



The pelvic girdle is large, the total expanse of theossa innominata 

 being 140 centimetres. This and the other portions of the skeleton 

 an" i 1 1 shortly be examined and described in detail, when the probable 

 position of the animal may be determined. At present it will be 

 sufficient to mention that from the characters of the teeth it seems 

 probable that we have in Arsinoitherium an ancestral form of rhinoceros, 

 although the presence of the protuberance above, recalling the Dino- 

 cerata of North America, at once distinguishes it from the known 

 rhinoceroses, in which the horns have no bony attachment to the skull. 



Hugh J. L. BEADNELL. 



Cairo, 28th January, 1902. 



